Homeboy was lying
Actually, Olivia was wrong to take on the accused assassin’s case. Because the man was lying the whole entire time. Once the autopsy confirmed that the bullet did indeed come from his gun, Olivia comes back to question him. And his face shifted in a way that was so very, very disturbing, as he told her that he wanted to go down on the list of people who took down–or tried to take down– American presidents. And now that they proved it belonged to him, he’d finally have that title. It was very sick. And Olivia flew out of that room.